道路复合曲线放样元素的快速计算及精度评定

为了实现道路复杂曲线中桩和边桩坐标、中桩到边桩的坐标方位角等放样元素的快速计算,并保证放样元素计算的精度和准确度,总结了各种道路曲线放样元素计算的基本理论和方法,推导出道路曲线放样元素计算的基本公式,提出简明、便捷的复合曲线放样元素计算方法、精度评定方法及评定模型,并利用Visual Basic语言程序实现了道路曲线放样元素的快速计算。经某复杂立交中完整缓和曲线、非完整缓和曲线计算验证,表明该方法计算得到的放样元素与设计值之间的差异仅在毫米级,满足道路复杂曲线放样的要求。

Rapid calculation of road compound curve lofting elements and precision assessment

In order to achieve rapid calculation of road compound curve lofting elements including the middle and side pile coordinates,and the azimuth from the middle pile to the side pile,and to ensure the calculation precision and accuracy,various basic calculation theories and methods of the road curve lofting elements were summarized and the calculation formula of lofting elements was derived.A simple and convenient method for calculating compound curve lofting elements and the precision assessment methods and models are proposed.The Visual Basic language was used to achieve the rapid calculation of road curve lofting elements.Verified by calculating a complete transition curve and non-complete transition curve in a complex interchange,the proposed method was proven to have a millimeter-level difference between designed and calculated values of the lofting elements,which indicated that the requirements of the road compound curve lofting were fully met.